公开(公告)号：US20180315410A1

公开(公告)日：2018-11-01

申请号：US15955135

申请日：2018-04-17

申请人： Lydall, Inc.

发明人： Brian Matthew Jarrard ,  Stephen Craig Brown

IPC分类号： G10K11/168

CPC分类号： B32B3/28 ,  B32B1/00 ,  B32B3/02 ,  B32B3/263 ,  B32B3/30 ,  B32B5/245 ,  B32B5/26 ,  B32B5/32 ,  B32B2307/102 ,  B32B2307/724 ,  B32B2605/00 ,  B32B2605/08 ,  B60R13/08

摘要： An acoustical insulator having a composite air flow resistance is presented. The insulator may be for being positioned within a void space, and may include first and second sheets. The sheets may be joined to each other in an overlapping configuration along their respective peripheral edges, thereby defining an overlapped area between them. The sheets may include contours, such that the acoustical insulator substantially conforms to a peripheral boundary of the void space. The overlapped area may define a substantially closed air gap between the adjoined first and second sheets, the air gap having variable gap lengths along the respective sheet areas. The density of at least one of the sheets may vary with the variable gap length, so that the sheets and air gap collectively provide a composite air flow resistance through the insulator to absorb noise at a predetermined peak frequency.